GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2000 🢒 LeSabre 🢒 DTC 🢒 DTC B3031 Key Decoder Device in Assem Learn Mode

Circuit Description

The vehicle theft deterrent (VTD) module checks the memory to see if the learn coded key setting is on. If the learn coded key setting is on, the VTD sets this DTC.

Running the DTC

The VTD must see the ignition switch input. The VTD can not have a B1327 set as a current DTC.

Conditions for Setting the DTC

If the learn coded key setting is on, the VTD sets this DTC.

Action Taken When the DTC Sets

The VTD will learn the key code. The VTD will illuminate the security indicator.

Conditions for Clearing the MIL/DTC

The VTD module clears the current status of the DTC when the module does not see the learn coded key setting as on. The DTC will still be retrieved as a current DTC until the ignition switch is cycled. The DTC will become a history DTC at that time.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. In order to set this code, a key with a working transponder was read by the VTD (Pass Key® III) module. For that key to operate the vehicle, a 10 Minute or 30 Minute Re-Learn Procedure must be performed.

Step

Action

Yes

No

1

Did you perform A Diagnostic System Check - Vehicle Theft Deterrent?

Go to Step 2

Go to Diagnostic System Check - Theft Deterrent

2

Important: If a 10 Minute or 30 Minute Re-Learn Procedure is performed, all keys not learned at that time will be erased and will not be recognized. Perform the Quick Learn Procedure on all keys, or instruct the customer how to perform the Quick Learn Procedure.

Perform the VTD (Pass Key® III) module learn procedure. Refer to Programming Theft Deterrent System Components .

Is the procedure complete?

Go to Step 3

--

3
  1. Use a scan tool in order to clear the DTCs.
  2. Attempt to start the vehicle.

Does the DTC reset?

Go to Step 2

System OK